Sony Tektronix WFM 1125, User Manual

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Glossary
Glossary-4
WFM 1125 Option 0A/0B/0C/0D User Manual
In signal terms, saturation is determined by the ratio between luminance level
and chrominance amplitude. It should be noted that a vectorscope does not
display saturation; the length of the vectors represents chrominance
amplitude. In order to verify that the saturation of the colors in a color bar
signal is correct, you must check luminance amplitudes with a waveform
monitor in addition to observing the vectors.
Termination
In order to accurately send a signal through a transmission line, there must be
an impedance at the end which matches the impedance of the source and of
the line itself. Amplitude errors and reflections will otherwise result. Video is
a 75
W
system, so a 75
W
terminator must be put at the end of the signal path.
U
The B–Y signal after a weighting factor of 0.493 has been applied. The
weighting is necessary to reduce peak modulation in the composite signal.
V
The R–Y signal after a weighting factor of 0.877 has been applied. The
weighting is necessary to reduce peak modulation in the composite signal.
Vectorscope
A specialized oscilloscope which demodulates the video signal and presents
a display of R–Y versus B–Y in NTSC systems (or V versus U in PAL
systems). The angle and magnitude of the displayed vectors are respectively
related to hue and saturation.
Vertical Interval
The synchronizing information which appears between fields and signals the
picture monitor to go back to the top of the screen to begin another vertical
scan.
Waveform Monitor
A specialized oscilloscope that plots voltage versus time to evaluate
television signals.
Y
See Luminance.